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Zeroshell Delivers Big Network Services in a Small Package

"Zeroshell weighs in at just over 100 megabytes, making it
perfect for embedded devices like PC Engines WRAP boards, Soekris
boards, Mini-ITX, and other small form-factor computers. It also
installs to a hard drive on ordinary PC hardware, or it can be run
from a bootable CD for easy testing. Even production systems can
run from the CD; you just need another device for data and log
storage."

"Suppose you have a nice little PC Engines WRAP board. Get
yourself a 512MB Compact Flash card, and you'll have 400MB
available for data storage. Which should be way more than you need,
especially if you have a separate syslog server. It is a good
practice to store logfiles on a separate device for better security
and performance, and fewer writes on your CF card."